Intro APR winner

Citi® Diamond Preferred® Card
The Citi Diamond Preferred card stands out in this category since you can take advantage of an intro APR offer of 0% for 21 months on Balance Transfers made in the first four months of account opening (17.24% – 27.99% (Variable) after).
Although this is one of the longest 0 percent intro APR periods for balance transfers on the market, you’ll only get 0% for 12 months on Purchases with this card (17.24% – 27.99% (Variable) after that).
In comparison, the Discover it Cash Back offers a 0% intro APR for 15 months (18.24% – 27.24% Variable APR after that).
The Citi Diamond Preferred’s additional six months to pay down existing debt interest-free could be of tremendous benefit if you have a lot of high-interest debt you need to consolidate.
After all, a longer 0 percent intro APR timeline could allow you to pay down a larger balance before the introductory rate expires, or you could pay a lower amount each month during the introductory period and still achieve debt payoff.